Remove the border of your ad

Again, this follows the same principle as above. If you put a border around your ad, they will look
like ads. They will scream aloud, “This is an ad!” And this will kill your CTR.
If you remove the border, they will blend with your content.

You might think this is something trivial but many people report a massive increase in their CTR,
just by removing their border. So let the border go by having a similar color as your background